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<br />the Wild Horse Creek levee, riprap was placed on the curve of the levee where it changes <br />alignment to parallel Wild Horse Creek. The other section of riprap was placed along the <br />Arkansas River levee to protect against damaging flows from Two Buttes Creek as it joins the <br />Arkansas River. This protection begins about 800 feet west of the State Highway 89 crossing <br />of the levee and extends upstream (west) for about 2000 feet. Riprap for bank protection was <br />placed at the abutments of each bridge over Wild Horse Creek and the Arkansas River, and for <br />50 feet on each side of the U.S. Highway 50 and AT&SF Railroad stop log structures. <br /> <br />Concrete stop log abutments were placed in the levee west of the Town where U.S. <br />Highway 50 and the AT&SF Railroad crosses the levee. There are two closures for the railroad, <br />one for the main line and one for a siding. Galvanized steel stop logs are to be placed between <br />the abutments for protection when flows exceed the 25-year flood (17,200 c.f.s. in Wild Horse <br />Creek, 40,000 c.f.s. in the Arkansas River). Stop logs for all three closures are stored in a small <br />building approximately 100 yards south of the U.S. Highway 50 stop log structure and 200 yards <br />north of the AT &SF Railroad structures. <br /> <br />Two interior ponding areas were formed as a result of levee borrow. These areas are <br />shown as borrow areas I, III, and IlIA on the General Plan map, Figure I. The smaller of the <br />areas (borrow area I) is approximately I mile north of Town on the landside of the levee. The <br />larger of the ponding areas (borrow areas III and IlIA) is approximately 1/2 mile south of Town <br />on the landside of the levee. Both interior ponding areas are utilized to pond interior drainage <br />runoff until the Wild Horse Creek and Arkansas River flooding recedes. The ponding areas are <br />drained through the levee with 30-inch gravity outlet structures with flap gates to keep <br />floodwaters from flowing to the landside of the drain. Both areas have relatively low valued <br />agricultural use so damages are low and limited ma.inly to temporary inconvenience and nuisance. <br />The remaining areas on the landside of the levee drain toward the east to the Arbmsas River. <br /> <br />Ooeration and Maintenance Resoonsibilitv <br /> <br />After construction was completed on the Project, operation and maintenance <br />responsibilities were turned over to the Holly Flood Control, Drainage and Sanitation District to <br />insure serviceability of the project. The O&M Manual prepared by the Corps for District use <br />outlines these responsibilities. The District is also responsible for annual opera.tion and <br />maintenance costs. Mr. W.O. Randle, Secretary of the District, stated that the Holly local fire <br />and ambulance volunteers do the operation and mainknance work. <br /> <br />The O&M Manual for the Project states that stop log closure shall begin when flooding <br />in Wild Horse Creek and the Arkansas River rises to elevation 3398.0, which is 2 feet below the <br />top of the AT&SF Railroad rail and 4.2 feet below the U.S. Highway 50 roadway. The O&M <br />Manual stated that a flood early warning system was being designed and would be installed by <br />the U.S. Weather Service in the near future. According to Mr. W.O. Randle, Secretary of the <br />District, the flood early warning system was designed and installed with sensors on Two Butte <br />Creek south of the Town and on Wild Horse Creek north of the Town. Mr. Randle indicated that <br />the system was not satisfactory because the sensing device was set so high that no flows have <br /> <br />6 <br />